Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
joeqsmith:
--- Quote from: SJL-Instruments on January 24, 2024, 01:33:02 am ---Just to clarify: We could make a test fixture that outputs two synchronized fast rising edges. You'd then connect CH1 to one output, CH2 to the other, and click a button. Repeat with CH3,CH4,etc in place of CH2. This would compensate for any probe length mismatches. Would this fit the bill?
--- End quote ---
The probes themselves may have a fair amount of skew. You could use a single output, rotating through each channel and then aligning them.
A more pressing problem is that the new software does not always seem to catch the glitches. They still appear to happen towards the start of the sweep as before.
SJL-Instruments:
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---The probes themselves may have a fair amount of skew. You could use a single output, rotating through each channel and then aligning them.
--- End quote ---
The difficulty here is that CH1 needs to see a trigger to view any waveform on the other channels (so two outputs are needed). The solution we proposed aligns each probe to CH1 in turn (thus eliminating the probe-to-probe skew). Or perhaps we're misunderstanding your proposal.
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---A more pressing problem is that the new software does not always seem to catch the glitches. They still appear to happen towards the start of the sweep as before.
--- End quote ---
Thanks for catching this - we'll see if we can reproduce this with extended testing. We've increased the urgency of the debugging/firmware fix. Do you ever see any glitches from the software after 12 ns?
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And just to double-check - you are using v2.5.5 downloaded from the website, not any of the v2.5.5 pre-release versions we sent, correct?
joeqsmith:
One possible clue is that when I mentioned that the glitches are commonly negative, it seems to depend on the level of the signal when it first starts acquiring data.
joeqsmith:
--- Quote from: SJL-Instruments on January 24, 2024, 02:00:42 am ---
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---The probes themselves may have a fair amount of skew. You could use a single output, rotating through each channel and then aligning them.
--- End quote ---
The difficulty here is that CH1 needs to see a trigger to view any waveform on the other channels (so two outputs are needed). The solution we proposed aligns each probe to CH1 in turn (thus eliminating the probe-to-probe skew). Or perhaps we're misunderstanding your proposal.
--- End quote ---
Yes, that is correct. I agree with your original proposal.
--- Quote from: SJL-Instruments on January 24, 2024, 02:00:42 am ---
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---A more pressing problem is that the new software does not always seem to catch the glitches. They still appear to happen towards the start of the sweep as before.
--- End quote ---
Thanks for catching this - we'll see if we can reproduce this with extended testing. We've increased the urgency of the debugging/firmware fix. Do you ever see any glitches from the software after 12 ns?
--- End quote ---
I can't say for sure without an automated way to collect the min/max. But, yes it does happen most often between 11 and 12 ns.
joeqsmith:
To be clear again, my software makes no attempt to correct these glitches. Your software may behave differently What I can show you with my software is the min/max capturing six different events and they all occur prior to 12ns. If I allow it to run long enough, I will see glitches in other areas but the majority happen towards the start of the sweep.
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